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<a name="Overview"></a>
<div class="header">
<p>
Next: <a href="Invoking.html#Invoking" accesskey="n" rel="next">Invoking</a>, Previous: <a href="index.html#Top" accesskey="p" rel="prev">Top</a>, Up: <a href="index.html#Top" accesskey="u" rel="up">Top</a> &nbsp; [<a href="index.html#SEC_Contents" title="Table of contents" rel="contents">Contents</a>][<a href="AS-Index.html#AS-Index" title="Index" rel="index">Index</a>]</p>
</div>
<hr>
<a name="Overview-1"></a>
<h2 class="chapter">1 Overview</h2>

<a name="index-invocation-summary"></a>
<a name="index-option-summary"></a>
<a name="index-summary-of-options"></a>
<p>Here is a brief summary of how to invoke <code>as</code>.  For details,
see <a href="Invoking.html#Invoking">Command-Line Options</a>.
</p>


<div class="smallexample">
<pre class="smallexample">as [<b>-a</b>[<b>cdghlns</b>][=<var>file</var>]] [<b>&ndash;alternate</b>] [<b>-D</b>]
 [<b>&ndash;compress-debug-sections</b>]  [<b>&ndash;nocompress-debug-sections</b>]
 [<b>&ndash;debug-prefix-map</b> <var>old</var>=<var>new</var>]
 [<b>&ndash;defsym</b> <var>sym</var>=<var>val</var>] [<b>-f</b>] [<b>-g</b>] [<b>&ndash;gstabs</b>]
 [<b>&ndash;gstabs+</b>] [<b>&ndash;gdwarf-2</b>] [<b>&ndash;gdwarf-sections</b>]
 [<b>&ndash;help</b>] [<b>-I</b> <var>dir</var>] [<b>-J</b>]
 [<b>-K</b>] [<b>-L</b>] [<b>&ndash;listing-lhs-width</b>=<var>NUM</var>]
 [<b>&ndash;listing-lhs-width2</b>=<var>NUM</var>] [<b>&ndash;listing-rhs-width</b>=<var>NUM</var>]
 [<b>&ndash;listing-cont-lines</b>=<var>NUM</var>] [<b>&ndash;keep-locals</b>]
 [<b>&ndash;no-pad-sections</b>]
 [<b>-o</b> <var>objfile</var>] [<b>-R</b>]
 [<b>&ndash;hash-size</b>=<var>NUM</var>] [<b>&ndash;reduce-memory-overheads</b>]
 [<b>&ndash;statistics</b>]
 [<b>-v</b>] [<b>-version</b>] [<b>&ndash;version</b>]
 [<b>-W</b>] [<b>&ndash;warn</b>] [<b>&ndash;fatal-warnings</b>] [<b>-w</b>] [<b>-x</b>]
 [<b>-Z</b>] [<b>@<var>FILE</var></b>]
 [<b>&ndash;sectname-subst</b>] [<b>&ndash;size-check=[error|warning]</b>]
 [<b>&ndash;elf-stt-common=[no|yes]</b>]
 [<b>&ndash;target-help</b>] [<var>target-options</var>]
 [<b>&ndash;</b>|<var>files</var> &hellip;]

<em>Target AArch64 options:</em>
   [<b>-EB</b>|<b>-EL</b>]
   [<b>-mabi</b>=<var>ABI</var>]

<em>Target Alpha options:</em>
   [<b>-m<var>cpu</var></b>]
   [<b>-mdebug</b> | <b>-no-mdebug</b>]
   [<b>-replace</b> | <b>-noreplace</b>]
   [<b>-relax</b>] [<b>-g</b>] [<b>-G<var>size</var></b>]
   [<b>-F</b>] [<b>-32addr</b>]

<em>Target ARC options:</em>
   [<b>-mcpu=<var>cpu</var></b>]
   [<b>-mA6</b>|<b>-mARC600</b>|<b>-mARC601</b>|<b>-mA7</b>|<b>-mARC700</b>|<b>-mEM</b>|<b>-mHS</b>]
   [<b>-mcode-density</b>]
   [<b>-mrelax</b>]
   [<b>-EB</b>|<b>-EL</b>]

<em>Target ARM options:</em>
   [<b>-mcpu</b>=<var>processor</var>[+<var>extension</var>&hellip;]]
   [<b>-march</b>=<var>architecture</var>[+<var>extension</var>&hellip;]]
   [<b>-mfpu</b>=<var>floating-point-format</var>]
   [<b>-mfloat-abi</b>=<var>abi</var>]
   [<b>-meabi</b>=<var>ver</var>]
   [<b>-mthumb</b>]
   [<b>-EB</b>|<b>-EL</b>]
   [<b>-mapcs-32</b>|<b>-mapcs-26</b>|<b>-mapcs-float</b>|
    <b>-mapcs-reentrant</b>]
   [<b>-mthumb-interwork</b>] [<b>-k</b>]

<em>Target Blackfin options:</em>
   [<b>-mcpu</b>=<var>processor</var>[-<var>sirevision</var>]]
   [<b>-mfdpic</b>]
   [<b>-mno-fdpic</b>]
   [<b>-mnopic</b>]

<em>Target CRIS options:</em>
   [<b>&ndash;underscore</b> | <b>&ndash;no-underscore</b>]
   [<b>&ndash;pic</b>] [<b>-N</b>]
   [<b>&ndash;emulation=criself</b> | <b>&ndash;emulation=crisaout</b>]
   [<b>&ndash;march=v0_v10</b> | <b>&ndash;march=v10</b> | <b>&ndash;march=v32</b> | <b>&ndash;march=common_v10_v32</b>]

<em>Target D10V options:</em>
   [<b>-O</b>]

<em>Target D30V options:</em>
   [<b>-O</b>|<b>-n</b>|<b>-N</b>]

<em>Target EPIPHANY options:</em>
   [<b>-mepiphany</b>|<b>-mepiphany16</b>]

<em>Target H8/300 options:</em>
   [-h-tick-hex]

<em>Target i386 options:</em>
   [<b>&ndash;32</b>|<b>&ndash;x32</b>|<b>&ndash;64</b>] [<b>-n</b>]
   [<b>-march</b>=<var>CPU</var>[+<var>EXTENSION</var>&hellip;]] [<b>-mtune</b>=<var>CPU</var>]

<em>Target i960 options:</em>
   [<b>-ACA</b>|<b>-ACA_A</b>|<b>-ACB</b>|<b>-ACC</b>|<b>-AKA</b>|<b>-AKB</b>|
    <b>-AKC</b>|<b>-AMC</b>]
   [<b>-b</b>] [<b>-no-relax</b>]

<em>Target IA-64 options:</em>
   [<b>-mconstant-gp</b>|<b>-mauto-pic</b>]
   [<b>-milp32</b>|<b>-milp64</b>|<b>-mlp64</b>|<b>-mp64</b>]
   [<b>-mle</b>|<b>mbe</b>]
   [<b>-mtune=itanium1</b>|<b>-mtune=itanium2</b>]
   [<b>-munwind-check=warning</b>|<b>-munwind-check=error</b>]
   [<b>-mhint.b=ok</b>|<b>-mhint.b=warning</b>|<b>-mhint.b=error</b>]
   [<b>-x</b>|<b>-xexplicit</b>] [<b>-xauto</b>] [<b>-xdebug</b>]

<em>Target IP2K options:</em>
   [<b>-mip2022</b>|<b>-mip2022ext</b>]

<em>Target M32C options:</em>
   [<b>-m32c</b>|<b>-m16c</b>] [-relax] [-h-tick-hex]

<em>Target M32R options:</em>
   [<b>&ndash;m32rx</b>|<b>&ndash;[no-]warn-explicit-parallel-conflicts</b>|
   <b>&ndash;W[n]p</b>]

<em>Target M680X0 options:</em>
   [<b>-l</b>] [<b>-m68000</b>|<b>-m68010</b>|<b>-m68020</b>|&hellip;]

<em>Target M68HC11 options:</em>
   [<b>-m68hc11</b>|<b>-m68hc12</b>|<b>-m68hcs12</b>|<b>-mm9s12x</b>|<b>-mm9s12xg</b>]
   [<b>-mshort</b>|<b>-mlong</b>]
   [<b>-mshort-double</b>|<b>-mlong-double</b>]
   [<b>&ndash;force-long-branches</b>] [<b>&ndash;short-branches</b>]
   [<b>&ndash;strict-direct-mode</b>] [<b>&ndash;print-insn-syntax</b>]
   [<b>&ndash;print-opcodes</b>] [<b>&ndash;generate-example</b>]

<em>Target MCORE options:</em>
   [<b>-jsri2bsr</b>] [<b>-sifilter</b>] [<b>-relax</b>]
   [<b>-mcpu=[210|340]</b>]

<em>Target Meta options:</em>
   [<b>-mcpu=<var>cpu</var></b>] [<b>-mfpu=<var>cpu</var></b>] [<b>-mdsp=<var>cpu</var></b>]
<em>Target MICROBLAZE options:</em>

<em>Target MIPS options:</em>
   [<b>-nocpp</b>] [<b>-EL</b>] [<b>-EB</b>] [<b>-O</b>[<var>optimization level</var>]]
   [<b>-g</b>[<var>debug level</var>]] [<b>-G</b> <var>num</var>] [<b>-KPIC</b>] [<b>-call_shared</b>]
   [<b>-non_shared</b>] [<b>-xgot</b> [<b>-mvxworks-pic</b>]
   [<b>-mabi</b>=<var>ABI</var>] [<b>-32</b>] [<b>-n32</b>] [<b>-64</b>] [<b>-mfp32</b>] [<b>-mgp32</b>]
   [<b>-mfp64</b>] [<b>-mgp64</b>] [<b>-mfpxx</b>]
   [<b>-modd-spreg</b>] [<b>-mno-odd-spreg</b>]
   [<b>-march</b>=<var>CPU</var>] [<b>-mtune</b>=<var>CPU</var>] [<b>-mips1</b>] [<b>-mips2</b>]
   [<b>-mips3</b>] [<b>-mips4</b>] [<b>-mips5</b>] [<b>-mips32</b>] [<b>-mips32r2</b>]
   [<b>-mips32r3</b>] [<b>-mips32r5</b>] [<b>-mips32r6</b>] [<b>-mips64</b>] [<b>-mips64r2</b>]
   [<b>-mips64r3</b>] [<b>-mips64r5</b>] [<b>-mips64r6</b>]
   [<b>-construct-floats</b>] [<b>-no-construct-floats</b>]
   [<b>-mnan=<var>encoding</var></b>]
   [<b>-trap</b>] [<b>-no-break</b>] [<b>-break</b>] [<b>-no-trap</b>]
   [<b>-mips16</b>] [<b>-no-mips16</b>]
   [<b>-mmicromips</b>] [<b>-mno-micromips</b>]
   [<b>-msmartmips</b>] [<b>-mno-smartmips</b>]
   [<b>-mips3d</b>] [<b>-no-mips3d</b>]
   [<b>-mdmx</b>] [<b>-no-mdmx</b>]
   [<b>-mdsp</b>] [<b>-mno-dsp</b>]
   [<b>-mdspr2</b>] [<b>-mno-dspr2</b>]
   [<b>-mdspr3</b>] [<b>-mno-dspr3</b>]
   [<b>-mmsa</b>] [<b>-mno-msa</b>]
   [<b>-mxpa</b>] [<b>-mno-xpa</b>]
   [<b>-mmt</b>] [<b>-mno-mt</b>]
   [<b>-mmcu</b>] [<b>-mno-mcu</b>]
   [<b>-minsn32</b>] [<b>-mno-insn32</b>]
   [<b>-mfix7000</b>] [<b>-mno-fix7000</b>]
   [<b>-mfix-rm7000</b>] [<b>-mno-fix-rm7000</b>]
   [<b>-mfix-vr4120</b>] [<b>-mno-fix-vr4120</b>]
   [<b>-mfix-vr4130</b>] [<b>-mno-fix-vr4130</b>]
   [<b>-mdebug</b>] [<b>-no-mdebug</b>]
   [<b>-mpdr</b>] [<b>-mno-pdr</b>]

<em>Target MMIX options:</em>
   [<b>&ndash;fixed-special-register-names</b>] [<b>&ndash;globalize-symbols</b>]
   [<b>&ndash;gnu-syntax</b>] [<b>&ndash;relax</b>] [<b>&ndash;no-predefined-symbols</b>]
   [<b>&ndash;no-expand</b>] [<b>&ndash;no-merge-gregs</b>] [<b>-x</b>]
   [<b>&ndash;linker-allocated-gregs</b>]

<em>Target Nios II options:</em>
   [<b>-relax-all</b>] [<b>-relax-section</b>] [<b>-no-relax</b>]
   [<b>-EB</b>] [<b>-EL</b>]

<em>Target NDS32 options:</em>
    [<b>-EL</b>] [<b>-EB</b>] [<b>-O</b>] [<b>-Os</b>] [<b>-mcpu=<var>cpu</var></b>]
    [<b>-misa=<var>isa</var></b>] [<b>-mabi=<var>abi</var></b>] [<b>-mall-ext</b>]
    [<b>-m[no-]16-bit</b>]  [<b>-m[no-]perf-ext</b>] [<b>-m[no-]perf2-ext</b>]
    [<b>-m[no-]string-ext</b>] [<b>-m[no-]dsp-ext</b>] [<b>-m[no-]mac</b>] [<b>-m[no-]div</b>]
    [<b>-m[no-]audio-isa-ext</b>] [<b>-m[no-]fpu-sp-ext</b>] [<b>-m[no-]fpu-dp-ext</b>]
    [<b>-m[no-]fpu-fma</b>] [<b>-mfpu-freg=<var>FREG</var></b>] [<b>-mreduced-regs</b>]
    [<b>-mfull-regs</b>] [<b>-m[no-]dx-regs</b>] [<b>-mpic</b>] [<b>-mno-relax</b>]
    [<b>-mb2bb</b>]

<em>Target PDP11 options:</em>
   [<b>-mpic</b>|<b>-mno-pic</b>] [<b>-mall</b>] [<b>-mno-extensions</b>]
   [<b>-m</b><var>extension</var>|<b>-mno-</b><var>extension</var>]
   [<b>-m</b><var>cpu</var>] [<b>-m</b><var>machine</var>]

<em>Target picoJava options:</em>
   [<b>-mb</b>|<b>-me</b>]

<em>Target PowerPC options:</em>
   [<b>-a32</b>|<b>-a64</b>]
   [<b>-mpwrx</b>|<b>-mpwr2</b>|<b>-mpwr</b>|<b>-m601</b>|<b>-mppc</b>|<b>-mppc32</b>|<b>-m603</b>|<b>-m604</b>|<b>-m403</b>|<b>-m405</b>|
    <b>-m440</b>|<b>-m464</b>|<b>-m476</b>|<b>-m7400</b>|<b>-m7410</b>|<b>-m7450</b>|<b>-m7455</b>|<b>-m750cl</b>|<b>-mppc64</b>|
    <b>-m620</b>|<b>-me500</b>|<b>-e500x2</b>|<b>-me500mc</b>|<b>-me500mc64</b>|<b>-me5500</b>|<b>-me6500</b>|<b>-mppc64bridge</b>|
    <b>-mbooke</b>|<b>-mpower4</b>|<b>-mpwr4</b>|<b>-mpower5</b>|<b>-mpwr5</b>|<b>-mpwr5x</b>|<b>-mpower6</b>|<b>-mpwr6</b>|
    <b>-mpower7</b>|<b>-mpwr7</b>|<b>-mpower8</b>|<b>-mpwr8</b>|<b>-mpower9</b>|<b>-mpwr9</b><b>-ma2</b>|
    <b>-mcell</b>|<b>-mspe</b>|<b>-mtitan</b>|<b>-me300</b>|<b>-mcom</b>]
   [<b>-many</b>] [<b>-maltivec</b>|<b>-mvsx</b>|<b>-mhtm</b>|<b>-mvle</b>]
   [<b>-mregnames</b>|<b>-mno-regnames</b>]
   [<b>-mrelocatable</b>|<b>-mrelocatable-lib</b>|<b>-K PIC</b>] [<b>-memb</b>]
   [<b>-mlittle</b>|<b>-mlittle-endian</b>|<b>-le</b>|<b>-mbig</b>|<b>-mbig-endian</b>|<b>-be</b>]
   [<b>-msolaris</b>|<b>-mno-solaris</b>]
   [<b>-nops=<var>count</var></b>]

<em>Target RL78 options:</em>
   [<b>-mg10</b>]
   [<b>-m32bit-doubles</b>|<b>-m64bit-doubles</b>]

<em>Target RX options:</em>
   [<b>-mlittle-endian</b>|<b>-mbig-endian</b>]
   [<b>-m32bit-doubles</b>|<b>-m64bit-doubles</b>]
   [<b>-muse-conventional-section-names</b>]
   [<b>-msmall-data-limit</b>]
   [<b>-mpid</b>]
   [<b>-mrelax</b>]
   [<b>-mint-register=<var>number</var></b>]
   [<b>-mgcc-abi</b>|<b>-mrx-abi</b>]

<em>Target s390 options:</em>
   [<b>-m31</b>|<b>-m64</b>] [<b>-mesa</b>|<b>-mzarch</b>] [<b>-march</b>=<var>CPU</var>]
   [<b>-mregnames</b>|<b>-mno-regnames</b>]
   [<b>-mwarn-areg-zero</b>]

<em>Target SCORE options:</em>
   [<b>-EB</b>][<b>-EL</b>][<b>-FIXDD</b>][<b>-NWARN</b>]
   [<b>-SCORE5</b>][<b>-SCORE5U</b>][<b>-SCORE7</b>][<b>-SCORE3</b>]
   [<b>-march=score7</b>][<b>-march=score3</b>]
   [<b>-USE_R1</b>][<b>-KPIC</b>][<b>-O0</b>][<b>-G</b> <var>num</var>][<b>-V</b>]

<em>Target SPARC options:</em>
   [<b>-Av6</b>|<b>-Av7</b>|<b>-Av8</b>|<b>-Asparclet</b>|<b>-Asparclite</b>
    <b>-Av8plus</b>|<b>-Av8plusa</b>|<b>-Av9</b>|<b>-Av9a</b>]
   [<b>-xarch=v8plus</b>|<b>-xarch=v8plusa</b>] [<b>-bump</b>]
   [<b>-32</b>|<b>-64</b>]

<em>Target TIC54X options:</em>
 [<b>-mcpu=54[123589]</b>|<b>-mcpu=54[56]lp</b>] [<b>-mfar-mode</b>|<b>-mf</b>]
 [<b>-merrors-to-file</b> <var>&lt;filename&gt;</var>|<b>-me</b> <var>&lt;filename&gt;</var>]

<em>Target TIC6X options:</em>
   [<b>-march=<var>arch</var></b>] [<b>-mbig-endian</b>|<b>-mlittle-endian</b>]
   [<b>-mdsbt</b>|<b>-mno-dsbt</b>] [<b>-mpid=no</b>|<b>-mpid=near</b>|<b>-mpid=far</b>]
   [<b>-mpic</b>|<b>-mno-pic</b>]

<em>Target TILE-Gx options:</em>
   [<b>-m32</b>|<b>-m64</b>][<b>-EB</b>][<b>-EL</b>]

<em>Target Visium options:</em>
   [<b>-mtune=<var>arch</var></b>]

<em>Target Xtensa options:</em>
 [<b>&ndash;[no-]text-section-literals</b>] [<b>&ndash;[no-]auto-litpools</b>]
 [<b>&ndash;[no-]absolute-literals</b>]
 [<b>&ndash;[no-]target-align</b>] [<b>&ndash;[no-]longcalls</b>]
 [<b>&ndash;[no-]transform</b>]
 [<b>&ndash;rename-section</b> <var>oldname</var>=<var>newname</var>]
 [<b>&ndash;[no-]trampolines</b>]

<em>Target Z80 options:</em>
  [<b>-z80</b>] [<b>-r800</b>]
  [<b> -ignore-undocumented-instructions</b>] [<b>-Wnud</b>]
  [<b> -ignore-unportable-instructions</b>] [<b>-Wnup</b>]
  [<b> -warn-undocumented-instructions</b>] [<b>-Wud</b>]
  [<b> -warn-unportable-instructions</b>] [<b>-Wup</b>]
  [<b> -forbid-undocumented-instructions</b>] [<b>-Fud</b>]
  [<b> -forbid-unportable-instructions</b>] [<b>-Fup</b>]


</pre></div>


<dl compact="compact">
<dt><code>@<var>file</var></code></dt>
<dd><p>Read command-line options from <var>file</var>.  The options read are
inserted in place of the original @<var>file</var> option.  If <var>file</var>
does not exist, or cannot be read, then the option will be treated
literally, and not removed.  
</p>
<p>Options in <var>file</var> are separated by whitespace.  A whitespace
character may be included in an option by surrounding the entire
option in either single or double quotes.  Any character (including a
backslash) may be included by prefixing the character to be included
with a backslash.  The <var>file</var> may itself contain additional
@<var>file</var> options; any such options will be processed recursively.
</p>
</dd>
<dt><code>-a[cdghlmns]</code></dt>
<dd><p>Turn on listings, in any of a variety of ways:
</p>
<dl compact="compact">
<dt><code>-ac</code></dt>
<dd><p>omit false conditionals
</p>
</dd>
<dt><code>-ad</code></dt>
<dd><p>omit debugging directives
</p>
</dd>
<dt><code>-ag</code></dt>
<dd><p>include general information, like as version and options passed
</p>
</dd>
<dt><code>-ah</code></dt>
<dd><p>include high-level source
</p>
</dd>
<dt><code>-al</code></dt>
<dd><p>include assembly
</p>
</dd>
<dt><code>-am</code></dt>
<dd><p>include macro expansions
</p>
</dd>
<dt><code>-an</code></dt>
<dd><p>omit forms processing
</p>
</dd>
<dt><code>-as</code></dt>
<dd><p>include symbols
</p>
</dd>
<dt><code>=file</code></dt>
<dd><p>set the name of the listing file
</p></dd>
</dl>

<p>You may combine these options; for example, use &lsquo;<samp>-aln</samp>&rsquo; for assembly
listing without forms processing.  The &lsquo;<samp>=file</samp>&rsquo; option, if used, must be
the last one.  By itself, &lsquo;<samp>-a</samp>&rsquo; defaults to &lsquo;<samp>-ahls</samp>&rsquo;.
</p>
</dd>
<dt><code>--alternate</code></dt>
<dd><p>Begin in alternate macro mode.
See <a href="Altmacro.html#Altmacro"><code>.altmacro</code></a>.
</p>
</dd>
<dt><code>--compress-debug-sections</code></dt>
<dd><p>Compress DWARF debug sections using zlib with SHF_COMPRESSED from the
ELF ABI.  The resulting object file may not be compatible with older
linkers and object file utilities.  Note if compression would make a
given section <em>larger</em> then it is not compressed.
</p>
<a name="index-_002d_002dcompress_002ddebug_002dsections_003d-option"></a>
</dd>
<dt><code>--compress-debug-sections=none</code></dt>
<dt><code>--compress-debug-sections=zlib</code></dt>
<dt><code>--compress-debug-sections=zlib-gnu</code></dt>
<dt><code>--compress-debug-sections=zlib-gabi</code></dt>
<dd><p>These options control how DWARF debug sections are compressed.
<samp>--compress-debug-sections=none</samp> is equivalent to
<samp>--nocompress-debug-sections</samp>.
<samp>--compress-debug-sections=zlib</samp> and
<samp>--compress-debug-sections=zlib-gabi</samp> are equivalent to
<samp>--compress-debug-sections</samp>.
<samp>--compress-debug-sections=zlib-gnu</samp> compresses DWARF debug
sections using zlib.  The debug sections are renamed to begin with
&lsquo;<samp>.zdebug</samp>&rsquo;.  Note if compression would make a given section
<em>larger</em> then it is not compressed nor renamed.
</p>

</dd>
<dt><code>--nocompress-debug-sections</code></dt>
<dd><p>Do not compress DWARF debug sections.  This is usually the default for all
targets except the x86/x86_64, but a configure time option can be used to
override this.
</p>
</dd>
<dt><code>-D</code></dt>
<dd><p>Ignored.  This option is accepted for script compatibility with calls to
other assemblers.
</p>
</dd>
<dt><code>--debug-prefix-map <var>old</var>=<var>new</var></code></dt>
<dd><p>When assembling files in directory <samp><var>old</var></samp>, record debugging
information describing them as in <samp><var>new</var></samp> instead.
</p>
</dd>
<dt><code>--defsym <var>sym</var>=<var>value</var></code></dt>
<dd><p>Define the symbol <var>sym</var> to be <var>value</var> before assembling the input file.
<var>value</var> must be an integer constant.  As in C, a leading &lsquo;<samp>0x</samp>&rsquo;
indicates a hexadecimal value, and a leading &lsquo;<samp>0</samp>&rsquo; indicates an octal
value.  The value of the symbol can be overridden inside a source file via the
use of a <code>.set</code> pseudo-op.
</p>
</dd>
<dt><code>-f</code></dt>
<dd><p>&ldquo;fast&rdquo;&mdash;skip whitespace and comment preprocessing (assume source is
compiler output).
</p>
</dd>
<dt><code>-g</code></dt>
<dt><code>--gen-debug</code></dt>
<dd><p>Generate debugging information for each assembler source line using whichever
debug format is preferred by the target.  This currently means either STABS,
ECOFF or DWARF2.
</p>
</dd>
<dt><code>--gstabs</code></dt>
<dd><p>Generate stabs debugging information for each assembler line.  This
may help debugging assembler code, if the debugger can handle it.
</p>
</dd>
<dt><code>--gstabs+</code></dt>
<dd><p>Generate stabs debugging information for each assembler line, with GNU
extensions that probably only gdb can handle, and that could make other
debuggers crash or refuse to read your program.  This
may help debugging assembler code.  Currently the only GNU extension is
the location of the current working directory at assembling time.
</p>
</dd>
<dt><code>--gdwarf-2</code></dt>
<dd><p>Generate DWARF2 debugging information for each assembler line.  This
may help debugging assembler code, if the debugger can handle it.  Note&mdash;this
option is only supported by some targets, not all of them.
</p>
</dd>
<dt><code>--gdwarf-sections</code></dt>
<dd><p>Instead of creating a .debug_line section, create a series of
.debug_line.<var>foo</var> sections where <var>foo</var> is the name of the
corresponding code section.  For example a code section called <var>.text.func</var>
will have its dwarf line number information placed into a section called
<var>.debug_line.text.func</var>.  If the code section is just called <var>.text</var>
then debug line section will still be called just <var>.debug_line</var> without any
suffix.
</p>
</dd>
<dt><code>--size-check=error</code></dt>
<dt><code>--size-check=warning</code></dt>
<dd><p>Issue an error or warning for invalid ELF .size directive.
</p>
</dd>
<dt><code>--elf-stt-common=no</code></dt>
<dt><code>--elf-stt-common=yes</code></dt>
<dd><p>These options control whether the ELF assembler should generate common
symbols with the <code>STT_COMMON</code> type.  The default can be controlled
by a configure option <samp>--enable-elf-stt-common</samp>.
</p>
</dd>
<dt><code>--help</code></dt>
<dd><p>Print a summary of the command line options and exit.
</p>
</dd>
<dt><code>--target-help</code></dt>
<dd><p>Print a summary of all target specific options and exit.
</p>
</dd>
<dt><code>-I <var>dir</var></code></dt>
<dd><p>Add directory <var>dir</var> to the search list for <code>.include</code> directives.
</p>
</dd>
<dt><code>-J</code></dt>
<dd><p>Don&rsquo;t warn about signed overflow.
</p>
</dd>
<dt><code>-K</code></dt>
<dd><p>Issue warnings when difference tables altered for long displacements.
</p>
</dd>
<dt><code>-L</code></dt>
<dt><code>--keep-locals</code></dt>
<dd><p>Keep (in the symbol table) local symbols.  These symbols start with
system-specific local label prefixes, typically &lsquo;<samp>.L</samp>&rsquo; for ELF systems
or &lsquo;<samp>L</samp>&rsquo; for traditional a.out systems.
See <a href="Symbol-Names.html#Symbol-Names">Symbol Names</a>.
</p>
</dd>
<dt><code>--listing-lhs-width=<var>number</var></code></dt>
<dd><p>Set the maximum width, in words, of the output data column for an assembler
listing to <var>number</var>.
</p>
</dd>
<dt><code>--listing-lhs-width2=<var>number</var></code></dt>
<dd><p>Set the maximum width, in words, of the output data column for continuation
lines in an assembler listing to <var>number</var>.
</p>
</dd>
<dt><code>--listing-rhs-width=<var>number</var></code></dt>
<dd><p>Set the maximum width of an input source line, as displayed in a listing, to
<var>number</var> bytes.
</p>
</dd>
<dt><code>--listing-cont-lines=<var>number</var></code></dt>
<dd><p>Set the maximum number of lines printed in a listing for a single line of input
to <var>number</var> + 1.
</p>
</dd>
<dt><code>--no-pad-sections</code></dt>
<dd><p>Stop the assembler for padding the ends of output sections to the alignment
of that section.  The default is to pad the sections, but this can waste space
which might be needed on targets which have tight memory constraints.
</p>
</dd>
<dt><code>-o <var>objfile</var></code></dt>
<dd><p>Name the object-file output from <code>as</code> <var>objfile</var>.
</p>
</dd>
<dt><code>-R</code></dt>
<dd><p>Fold the data section into the text section.
</p>
</dd>
<dt><code>--hash-size=<var>number</var></code></dt>
<dd><p>Set the default size of GAS&rsquo;s hash tables to a prime number close to
<var>number</var>.  Increasing this value can reduce the length of time it takes the
assembler to perform its tasks, at the expense of increasing the assembler&rsquo;s
memory requirements.  Similarly reducing this value can reduce the memory
requirements at the expense of speed.
</p>
</dd>
<dt><code>--reduce-memory-overheads</code></dt>
<dd><p>This option reduces GAS&rsquo;s memory requirements, at the expense of making the
assembly processes slower.  Currently this switch is a synonym for
&lsquo;<samp>--hash-size=4051</samp>&rsquo;, but in the future it may have other effects as well.
</p>
</dd>
<dt><code>--sectname-subst</code></dt>
<dd><p>Honor substitution sequences in section names.
See <a href="Section.html#Section-Name-Substitutions"><code>.section <var>name</var></code></a>.
</p>
</dd>
<dt><code>--statistics</code></dt>
<dd><p>Print the maximum space (in bytes) and total time (in seconds) used by
assembly.
</p>
</dd>
<dt><code>--strip-local-absolute</code></dt>
<dd><p>Remove local absolute symbols from the outgoing symbol table.
</p>
</dd>
<dt><code>-v</code></dt>
<dt><code>-version</code></dt>
<dd><p>Print the <code>as</code> version.
</p>
</dd>
<dt><code>--version</code></dt>
<dd><p>Print the <code>as</code> version and exit.
</p>
</dd>
<dt><code>-W</code></dt>
<dt><code>--no-warn</code></dt>
<dd><p>Suppress warning messages.
</p>
</dd>
<dt><code>--fatal-warnings</code></dt>
<dd><p>Treat warnings as errors.
</p>
</dd>
<dt><code>--warn</code></dt>
<dd><p>Don&rsquo;t suppress warning messages or treat them as errors.
</p>
</dd>
<dt><code>-w</code></dt>
<dd><p>Ignored.
</p>
</dd>
<dt><code>-x</code></dt>
<dd><p>Ignored.
</p>
</dd>
<dt><code>-Z</code></dt>
<dd><p>Generate an object file even after errors.
</p>
</dd>
<dt><code>-- | <var>files</var> &hellip;</code></dt>
<dd><p>Standard input, or source files to assemble.
</p>
</dd>
</dl>


<p>See <a href="AArch64-Options.html#AArch64-Options">AArch64 Options</a>, for the options available when as is configured
for the 64-bit mode of the ARM Architecture (AArch64).
</p>



<p>See <a href="Alpha-Options.html#Alpha-Options">Alpha Options</a>, for the options available when as is configured
for an Alpha processor.
</p>


<p>The following options are available when as is configured for an ARC
processor.
</p>
<dl compact="compact">
<dt><code>-mcpu=<var>cpu</var></code></dt>
<dd><p>This option selects the core processor variant.
</p></dd>
<dt><code>-EB | -EL</code></dt>
<dd><p>Select either big-endian (-EB) or little-endian (-EL) output.
</p></dd>
<dt><code>-mcode-density</code></dt>
<dd><p>Enable Code Density extenssion instructions.
</p></dd>
</dl>

<p>The following options are available when as is configured for the ARM
processor family.
</p>
<dl compact="compact">
<dt><code>-mcpu=<var>processor</var>[+<var>extension</var>&hellip;]</code></dt>
<dd><p>Specify which ARM processor variant is the target.
</p></dd>
<dt><code>-march=<var>architecture</var>[+<var>extension</var>&hellip;]</code></dt>
<dd><p>Specify which ARM architecture variant is used by the target.
</p></dd>
<dt><code>-mfpu=<var>floating-point-format</var></code></dt>
<dd><p>Select which Floating Point architecture is the target.
</p></dd>
<dt><code>-mfloat-abi=<var>abi</var></code></dt>
<dd><p>Select which floating point ABI is in use.
</p></dd>
<dt><code>-mthumb</code></dt>
<dd><p>Enable Thumb only instruction decoding.
</p></dd>
<dt><code>-mapcs-32 | -mapcs-26 | -mapcs-float | -mapcs-reentrant</code></dt>
<dd><p>Select which procedure calling convention is in use.
</p></dd>
<dt><code>-EB | -EL</code></dt>
<dd><p>Select either big-endian (-EB) or little-endian (-EL) output.
</p></dd>
<dt><code>-mthumb-interwork</code></dt>
<dd><p>Specify that the code has been generated with interworking between Thumb and
ARM code in mind.
</p></dd>
<dt><code>-mccs</code></dt>
<dd><p>Turns on CodeComposer Studio assembly syntax compatibility mode.
</p></dd>
<dt><code>-k</code></dt>
<dd><p>Specify that PIC code has been generated.
</p></dd>
</dl>


<p>See <a href="Blackfin-Options.html#Blackfin-Options">Blackfin Options</a>, for the options available when as is
configured for the Blackfin processor family.
</p>


<p>See the info pages for documentation of the CRIS-specific options.
</p>
<p>The following options are available when as is configured for
a D10V processor.
</p><dl compact="compact">
<dd><a name="index-D10V-optimization"></a>
<a name="index-optimization_002c-D10V"></a>
</dd>
<dt><code>-O</code></dt>
<dd><p>Optimize output by parallelizing instructions.
</p></dd>
</dl>

<p>The following options are available when as is configured for a D30V
processor.
</p><dl compact="compact">
<dd><a name="index-D30V-optimization"></a>
<a name="index-optimization_002c-D30V"></a>
</dd>
<dt><code>-O</code></dt>
<dd><p>Optimize output by parallelizing instructions.
</p>
<a name="index-D30V-nops"></a>
</dd>
<dt><code>-n</code></dt>
<dd><p>Warn when nops are generated.
</p>
<a name="index-D30V-nops-after-32_002dbit-multiply"></a>
</dd>
<dt><code>-N</code></dt>
<dd><p>Warn when a nop after a 32-bit multiply instruction is generated.
</p></dd>
</dl>

<p>The following options are available when as is configured for the
Adapteva EPIPHANY series.
</p>
<p>See <a href="Epiphany-Options.html#Epiphany-Options">Epiphany Options</a>, for the options available when as is
configured for an Epiphany processor.
</p>




<p>See <a href="i386_002dOptions.html#i386_002dOptions">i386-Options</a>, for the options available when as is
configured for an i386 processor.
</p>


<p>The following options are available when as is configured for the
Intel 80960 processor.
</p>
<dl compact="compact">
<dt><code>-ACA | -ACA_A | -ACB | -ACC | -AKA | -AKB | -AKC | -AMC</code></dt>
<dd><p>Specify which variant of the 960 architecture is the target.
</p>
</dd>
<dt><code>-b</code></dt>
<dd><p>Add code to collect statistics about branches taken.
</p>
</dd>
<dt><code>-no-relax</code></dt>
<dd><p>Do not alter compare-and-branch instructions for long displacements;
error if necessary.
</p>
</dd>
</dl>

<p>The following options are available when as is configured for the
Ubicom IP2K series.
</p>
<dl compact="compact">
<dt><code>-mip2022ext</code></dt>
<dd><p>Specifies that the extended IP2022 instructions are allowed.
</p>
</dd>
<dt><code>-mip2022</code></dt>
<dd><p>Restores the default behaviour, which restricts the permitted instructions to
just the basic IP2022 ones.
</p>
</dd>
</dl>

<p>The following options are available when as is configured for the
Renesas M32C and M16C processors.
</p>
<dl compact="compact">
<dt><code>-m32c</code></dt>
<dd><p>Assemble M32C instructions.
</p>
</dd>
<dt><code>-m16c</code></dt>
<dd><p>Assemble M16C instructions (the default).
</p>
</dd>
<dt><code>-relax</code></dt>
<dd><p>Enable support for link-time relaxations.
</p>
</dd>
<dt><code>-h-tick-hex</code></dt>
<dd><p>Support H&rsquo;00 style hex constants in addition to 0x00 style.
</p>
</dd>
</dl>

<p>The following options are available when as is configured for the
Renesas M32R (formerly Mitsubishi M32R) series.
</p>
<dl compact="compact">
<dt><code>--m32rx</code></dt>
<dd><p>Specify which processor in the M32R family is the target.  The default
is normally the M32R, but this option changes it to the M32RX.
</p>
</dd>
<dt><code>--warn-explicit-parallel-conflicts or --Wp</code></dt>
<dd><p>Produce warning messages when questionable parallel constructs are
encountered.
</p>
</dd>
<dt><code>--no-warn-explicit-parallel-conflicts or --Wnp</code></dt>
<dd><p>Do not produce warning messages when questionable parallel constructs are
encountered.
</p>
</dd>
</dl>

<p>The following options are available when as is configured for the
Motorola 68000 series.
</p>
<dl compact="compact">
<dt><code>-l</code></dt>
<dd><p>Shorten references to undefined symbols, to one word instead of two.
</p>
</dd>
<dt><code>-m68000 | -m68008 | -m68010 | -m68020 | -m68030</code></dt>
<dt><code>| -m68040 | -m68060 | -m68302 | -m68331 | -m68332</code></dt>
<dt><code>| -m68333 | -m68340 | -mcpu32 | -m5200</code></dt>
<dd><p>Specify what processor in the 68000 family is the target.  The default
is normally the 68020, but this can be changed at configuration time.
</p>
</dd>
<dt><code>-m68881 | -m68882 | -mno-68881 | -mno-68882</code></dt>
<dd><p>The target machine does (or does not) have a floating-point coprocessor.
The default is to assume a coprocessor for 68020, 68030, and cpu32.  Although
the basic 68000 is not compatible with the 68881, a combination of the
two can be specified, since it&rsquo;s possible to do emulation of the
coprocessor instructions with the main processor.
</p>
</dd>
<dt><code>-m68851 | -mno-68851</code></dt>
<dd><p>The target machine does (or does not) have a memory-management
unit coprocessor.  The default is to assume an MMU for 68020 and up.
</p>
</dd>
</dl>


<p>See <a href="Nios-II-Options.html#Nios-II-Options">Nios II Options</a>, for the options available when as is configured
for an Altera Nios II processor.
</p>


<p>For details about the PDP-11 machine dependent features options,
see <a href="PDP_002d11_002dOptions.html#PDP_002d11_002dOptions">PDP-11-Options</a>.
</p>
<dl compact="compact">
<dt><code>-mpic | -mno-pic</code></dt>
<dd><p>Generate position-independent (or position-dependent) code.  The
default is <samp>-mpic</samp>.
</p>
</dd>
<dt><code>-mall</code></dt>
<dt><code>-mall-extensions</code></dt>
<dd><p>Enable all instruction set extensions.  This is the default.
</p>
</dd>
<dt><code>-mno-extensions</code></dt>
<dd><p>Disable all instruction set extensions.
</p>
</dd>
<dt><code>-m<var>extension</var> | -mno-<var>extension</var></code></dt>
<dd><p>Enable (or disable) a particular instruction set extension.
</p>
</dd>
<dt><code>-m<var>cpu</var></code></dt>
<dd><p>Enable the instruction set extensions supported by a particular CPU, and
disable all other extensions.
</p>
</dd>
<dt><code>-m<var>machine</var></code></dt>
<dd><p>Enable the instruction set extensions supported by a particular machine
model, and disable all other extensions.
</p></dd>
</dl>


<p>The following options are available when as is configured for
a picoJava processor.
</p>
<dl compact="compact">
<dd>
<a name="index-PJ-endianness"></a>
<a name="index-endianness_002c-PJ"></a>
<a name="index-big-endian-output_002c-PJ"></a>
</dd>
<dt><code>-mb</code></dt>
<dd><p>Generate &ldquo;big endian&rdquo; format output.
</p>
<a name="index-little-endian-output_002c-PJ"></a>
</dd>
<dt><code>-ml</code></dt>
<dd><p>Generate &ldquo;little endian&rdquo; format output.
</p>
</dd>
</dl>

<p>The following options are available when as is configured for the
Motorola 68HC11 or 68HC12 series.
</p>
<dl compact="compact">
<dt><code>-m68hc11 | -m68hc12 | -m68hcs12 | -mm9s12x | -mm9s12xg</code></dt>
<dd><p>Specify what processor is the target.  The default is
defined by the configuration option when building the assembler.
</p>
</dd>
<dt><code>--xgate-ramoffset</code></dt>
<dd><p>Instruct the linker to offset RAM addresses from S12X address space into
XGATE address space.
</p>
</dd>
<dt><code>-mshort</code></dt>
<dd><p>Specify to use the 16-bit integer ABI.
</p>
</dd>
<dt><code>-mlong</code></dt>
<dd><p>Specify to use the 32-bit integer ABI.
</p>
</dd>
<dt><code>-mshort-double</code></dt>
<dd><p>Specify to use the 32-bit double ABI.
</p>
</dd>
<dt><code>-mlong-double</code></dt>
<dd><p>Specify to use the 64-bit double ABI.
</p>
</dd>
<dt><code>--force-long-branches</code></dt>
<dd><p>Relative branches are turned into absolute ones. This concerns
conditional branches, unconditional branches and branches to a
sub routine.
</p>
</dd>
<dt><code>-S | --short-branches</code></dt>
<dd><p>Do not turn relative branches into absolute ones
when the offset is out of range.
</p>
</dd>
<dt><code>--strict-direct-mode</code></dt>
<dd><p>Do not turn the direct addressing mode into extended addressing mode
when the instruction does not support direct addressing mode.
</p>
</dd>
<dt><code>--print-insn-syntax</code></dt>
<dd><p>Print the syntax of instruction in case of error.
</p>
</dd>
<dt><code>--print-opcodes</code></dt>
<dd><p>Print the list of instructions with syntax and then exit.
</p>
</dd>
<dt><code>--generate-example</code></dt>
<dd><p>Print an example of instruction for each possible instruction and then exit.
This option is only useful for testing <code>as</code>.
</p>
</dd>
</dl>

<p>The following options are available when <code>as</code> is configured
for the SPARC architecture:
</p>
<dl compact="compact">
<dt><code>-Av6 | -Av7 | -Av8 | -Asparclet | -Asparclite</code></dt>
<dt><code>-Av8plus | -Av8plusa | -Av9 | -Av9a</code></dt>
<dd><p>Explicitly select a variant of the SPARC architecture.
</p>
<p>&lsquo;<samp>-Av8plus</samp>&rsquo; and &lsquo;<samp>-Av8plusa</samp>&rsquo; select a 32 bit environment.
&lsquo;<samp>-Av9</samp>&rsquo; and &lsquo;<samp>-Av9a</samp>&rsquo; select a 64 bit environment.
</p>
<p>&lsquo;<samp>-Av8plusa</samp>&rsquo; and &lsquo;<samp>-Av9a</samp>&rsquo; enable the SPARC V9 instruction set with
UltraSPARC extensions.
</p>
</dd>
<dt><code>-xarch=v8plus | -xarch=v8plusa</code></dt>
<dd><p>For compatibility with the Solaris v9 assembler.  These options are
equivalent to -Av8plus and -Av8plusa, respectively.
</p>
</dd>
<dt><code>-bump</code></dt>
<dd><p>Warn when the assembler switches to another architecture.
</p></dd>
</dl>

<p>The following options are available when as is configured for the &rsquo;c54x
architecture.
</p>
<dl compact="compact">
<dt><code>-mfar-mode</code></dt>
<dd><p>Enable extended addressing mode.  All addresses and relocations will assume
extended addressing (usually 23 bits).
</p></dd>
<dt><code>-mcpu=<var>CPU_VERSION</var></code></dt>
<dd><p>Sets the CPU version being compiled for.
</p></dd>
<dt><code>-merrors-to-file <var>FILENAME</var></code></dt>
<dd><p>Redirect error output to a file, for broken systems which don&rsquo;t support such
behaviour in the shell.
</p></dd>
</dl>

<p>The following options are available when as is configured for
a MIPS processor.
</p>
<dl compact="compact">
<dt><code>-G <var>num</var></code></dt>
<dd><p>This option sets the largest size of an object that can be referenced
implicitly with the <code>gp</code> register.  It is only accepted for targets that
use ECOFF format, such as a DECstation running Ultrix.  The default value is 8.
</p>
<a name="index-MIPS-endianness"></a>
<a name="index-endianness_002c-MIPS"></a>
<a name="index-big-endian-output_002c-MIPS"></a>
</dd>
<dt><code>-EB</code></dt>
<dd><p>Generate &ldquo;big endian&rdquo; format output.
</p>
<a name="index-little-endian-output_002c-MIPS"></a>
</dd>
<dt><code>-EL</code></dt>
<dd><p>Generate &ldquo;little endian&rdquo; format output.
</p>
<a name="index-MIPS-ISA"></a>
</dd>
<dt><code>-mips1</code></dt>
<dt><code>-mips2</code></dt>
<dt><code>-mips3</code></dt>
<dt><code>-mips4</code></dt>
<dt><code>-mips5</code></dt>
<dt><code>-mips32</code></dt>
<dt><code>-mips32r2</code></dt>
<dt><code>-mips32r3</code></dt>
<dt><code>-mips32r5</code></dt>
<dt><code>-mips32r6</code></dt>
<dt><code>-mips64</code></dt>
<dt><code>-mips64r2</code></dt>
<dt><code>-mips64r3</code></dt>
<dt><code>-mips64r5</code></dt>
<dt><code>-mips64r6</code></dt>
<dd><p>Generate code for a particular MIPS Instruction Set Architecture level.
&lsquo;<samp>-mips1</samp>&rsquo; is an alias for &lsquo;<samp>-march=r3000</samp>&rsquo;, &lsquo;<samp>-mips2</samp>&rsquo; is an
alias for &lsquo;<samp>-march=r6000</samp>&rsquo;, &lsquo;<samp>-mips3</samp>&rsquo; is an alias for
&lsquo;<samp>-march=r4000</samp>&rsquo; and &lsquo;<samp>-mips4</samp>&rsquo; is an alias for &lsquo;<samp>-march=r8000</samp>&rsquo;.
&lsquo;<samp>-mips5</samp>&rsquo;, &lsquo;<samp>-mips32</samp>&rsquo;, &lsquo;<samp>-mips32r2</samp>&rsquo;, &lsquo;<samp>-mips32r3</samp>&rsquo;,
&lsquo;<samp>-mips32r5</samp>&rsquo;, &lsquo;<samp>-mips32r6</samp>&rsquo;, &lsquo;<samp>-mips64</samp>&rsquo;, &lsquo;<samp>-mips64r2</samp>&rsquo;,
&lsquo;<samp>-mips64r3</samp>&rsquo;, &lsquo;<samp>-mips64r5</samp>&rsquo;, and &lsquo;<samp>-mips64r6</samp>&rsquo; correspond to generic
MIPS V, MIPS32, MIPS32 Release 2, MIPS32 Release 3, MIPS32 Release 5, MIPS32
Release 6, MIPS64, MIPS64 Release 2, MIPS64 Release 3, MIPS64 Release 5, and
MIPS64 Release 6 ISA processors, respectively.
</p>
</dd>
<dt><code>-march=<var>cpu</var></code></dt>
<dd><p>Generate code for a particular MIPS CPU.
</p>
</dd>
<dt><code>-mtune=<var>cpu</var></code></dt>
<dd><p>Schedule and tune for a particular MIPS CPU.
</p>
</dd>
<dt><code>-mfix7000</code></dt>
<dt><code>-mno-fix7000</code></dt>
<dd><p>Cause nops to be inserted if the read of the destination register
of an mfhi or mflo instruction occurs in the following two instructions.
</p>
</dd>
<dt><code>-mfix-rm7000</code></dt>
<dt><code>-mno-fix-rm7000</code></dt>
<dd><p>Cause nops to be inserted if a dmult or dmultu instruction is
followed by a load instruction.
</p>
</dd>
<dt><code>-mdebug</code></dt>
<dt><code>-no-mdebug</code></dt>
<dd><p>Cause stabs-style debugging output to go into an ECOFF-style .mdebug
section instead of the standard ELF .stabs sections.
</p>
</dd>
<dt><code>-mpdr</code></dt>
<dt><code>-mno-pdr</code></dt>
<dd><p>Control generation of <code>.pdr</code> sections.
</p>
</dd>
<dt><code>-mgp32</code></dt>
<dt><code>-mfp32</code></dt>
<dd><p>The register sizes are normally inferred from the ISA and ABI, but these
flags force a certain group of registers to be treated as 32 bits wide at
all times.  &lsquo;<samp>-mgp32</samp>&rsquo; controls the size of general-purpose registers
and &lsquo;<samp>-mfp32</samp>&rsquo; controls the size of floating-point registers.
</p>
</dd>
<dt><code>-mgp64</code></dt>
<dt><code>-mfp64</code></dt>
<dd><p>The register sizes are normally inferred from the ISA and ABI, but these
flags force a certain group of registers to be treated as 64 bits wide at
all times.  &lsquo;<samp>-mgp64</samp>&rsquo; controls the size of general-purpose registers
and &lsquo;<samp>-mfp64</samp>&rsquo; controls the size of floating-point registers.
</p>
</dd>
<dt><code>-mfpxx</code></dt>
<dd><p>The register sizes are normally inferred from the ISA and ABI, but using
this flag in combination with &lsquo;<samp>-mabi=32</samp>&rsquo; enables an ABI variant
which will operate correctly with floating-point registers which are
32 or 64 bits wide.
</p>
</dd>
<dt><code>-modd-spreg</code></dt>
<dt><code>-mno-odd-spreg</code></dt>
<dd><p>Enable use of floating-point operations on odd-numbered single-precision
registers when supported by the ISA.  &lsquo;<samp>-mfpxx</samp>&rsquo; implies
&lsquo;<samp>-mno-odd-spreg</samp>&rsquo;, otherwise the default is &lsquo;<samp>-modd-spreg</samp>&rsquo;.
</p>
</dd>
<dt><code>-mips16</code></dt>
<dt><code>-no-mips16</code></dt>
<dd><p>Generate code for the MIPS 16 processor.  This is equivalent to putting
<code>.set mips16</code> at the start of the assembly file.  &lsquo;<samp>-no-mips16</samp>&rsquo;
turns off this option.
</p>
</dd>
<dt><code>-mmicromips</code></dt>
<dt><code>-mno-micromips</code></dt>
<dd><p>Generate code for the microMIPS processor.  This is equivalent to putting
<code>.set micromips</code> at the start of the assembly file.  &lsquo;<samp>-mno-micromips</samp>&rsquo;
turns off this option.  This is equivalent to putting <code>.set nomicromips</code>
at the start of the assembly file.
</p>
</dd>
<dt><code>-msmartmips</code></dt>
<dt><code>-mno-smartmips</code></dt>
<dd><p>Enables the SmartMIPS extension to the MIPS32 instruction set. This is
equivalent to putting <code>.set smartmips</code> at the start of the assembly file.
&lsquo;<samp>-mno-smartmips</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mips3d</code></dt>
<dt><code>-no-mips3d</code></dt>
<dd><p>Generate code for the MIPS-3D Application Specific Extension.
This tells the assembler to accept MIPS-3D instructions.
&lsquo;<samp>-no-mips3d</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mdmx</code></dt>
<dt><code>-no-mdmx</code></dt>
<dd><p>Generate code for the MDMX Application Specific Extension.
This tells the assembler to accept MDMX instructions.
&lsquo;<samp>-no-mdmx</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mdsp</code></dt>
<dt><code>-mno-dsp</code></dt>
<dd><p>Generate code for the DSP Release 1 Application Specific Extension.
This tells the assembler to accept DSP Release 1 instructions.
&lsquo;<samp>-mno-dsp</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mdspr2</code></dt>
<dt><code>-mno-dspr2</code></dt>
<dd><p>Generate code for the DSP Release 2 Application Specific Extension.
This option implies &lsquo;<samp>-mdsp</samp>&rsquo;.
This tells the assembler to accept DSP Release 2 instructions.
&lsquo;<samp>-mno-dspr2</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mdspr3</code></dt>
<dt><code>-mno-dspr3</code></dt>
<dd><p>Generate code for the DSP Release 3 Application Specific Extension.
This option implies &lsquo;<samp>-mdsp</samp>&rsquo; and &lsquo;<samp>-mdspr2</samp>&rsquo;.
This tells the assembler to accept DSP Release 3 instructions.
&lsquo;<samp>-mno-dspr3</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mmsa</code></dt>
<dt><code>-mno-msa</code></dt>
<dd><p>Generate code for the MIPS SIMD Architecture Extension.
This tells the assembler to accept MSA instructions.
&lsquo;<samp>-mno-msa</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mxpa</code></dt>
<dt><code>-mno-xpa</code></dt>
<dd><p>Generate code for the MIPS eXtended Physical Address (XPA) Extension.
This tells the assembler to accept XPA instructions.
&lsquo;<samp>-mno-xpa</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mmt</code></dt>
<dt><code>-mno-mt</code></dt>
<dd><p>Generate code for the MT Application Specific Extension.
This tells the assembler to accept MT instructions.
&lsquo;<samp>-mno-mt</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-mmcu</code></dt>
<dt><code>-mno-mcu</code></dt>
<dd><p>Generate code for the MCU Application Specific Extension.
This tells the assembler to accept MCU instructions.
&lsquo;<samp>-mno-mcu</samp>&rsquo; turns off this option.
</p>
</dd>
<dt><code>-minsn32</code></dt>
<dt><code>-mno-insn32</code></dt>
<dd><p>Only use 32-bit instruction encodings when generating code for the
microMIPS processor.  This option inhibits the use of any 16-bit
instructions.  This is equivalent to putting <code>.set insn32</code> at
the start of the assembly file.  &lsquo;<samp>-mno-insn32</samp>&rsquo; turns off this
option.  This is equivalent to putting <code>.set noinsn32</code> at the
start of the assembly file.  By default &lsquo;<samp>-mno-insn32</samp>&rsquo; is
selected, allowing all instructions to be used.
</p>
</dd>
<dt><code>--construct-floats</code></dt>
<dt><code>--no-construct-floats</code></dt>
<dd><p>The &lsquo;<samp>--no-construct-floats</samp>&rsquo; option disables the construction of
double width floating point constants by loading the two halves of the
value into the two single width floating point registers that make up
the double width register.  By default &lsquo;<samp>--construct-floats</samp>&rsquo; is
selected, allowing construction of these floating point constants.
</p>
</dd>
<dt><code>--relax-branch</code></dt>
<dt><code>--no-relax-branch</code></dt>
<dd><p>The &lsquo;<samp>--relax-branch</samp>&rsquo; option enables the relaxation of out-of-range
branches.  By default &lsquo;<samp>--no-relax-branch</samp>&rsquo; is selected, causing any
out-of-range branches to produce an error.
</p>
</dd>
<dt><code>-mnan=<var>encoding</var></code></dt>
<dd><p>Select between the IEEE 754-2008 (<samp>-mnan=2008</samp>) or the legacy
(<samp>-mnan=legacy</samp>) NaN encoding format.  The latter is the default.
</p>
<a name="index-emulation"></a>
</dd>
<dt><code>--emulation=<var>name</var></code></dt>
<dd><p>This option was formerly used to switch between ELF and ECOFF output
on targets like IRIX 5 that supported both.  MIPS ECOFF support was
removed in GAS 2.24, so the option now serves little purpose.
It is retained for backwards compatibility.
</p>
<p>The available configuration names are: &lsquo;<samp>mipself</samp>&rsquo;, &lsquo;<samp>mipslelf</samp>&rsquo; and
&lsquo;<samp>mipsbelf</samp>&rsquo;.  Choosing &lsquo;<samp>mipself</samp>&rsquo; now has no effect, since the output
is always ELF.  &lsquo;<samp>mipslelf</samp>&rsquo; and &lsquo;<samp>mipsbelf</samp>&rsquo; select little- and
big-endian output respectively, but &lsquo;<samp>-EL</samp>&rsquo; and &lsquo;<samp>-EB</samp>&rsquo; are now the
preferred options instead.
</p>
</dd>
<dt><code>-nocpp</code></dt>
<dd><p><code>as</code> ignores this option.  It is accepted for compatibility with
the native tools.
</p>
</dd>
<dt><code>--trap</code></dt>
<dt><code>--no-trap</code></dt>
<dt><code>--break</code></dt>
<dt><code>--no-break</code></dt>
<dd><p>Control how to deal with multiplication overflow and division by zero.
&lsquo;<samp>--trap</samp>&rsquo; or &lsquo;<samp>--no-break</samp>&rsquo; (which are synonyms) take a trap exception
(and only work for Instruction Set Architecture level 2 and higher);
&lsquo;<samp>--break</samp>&rsquo; or &lsquo;<samp>--no-trap</samp>&rsquo; (also synonyms, and the default) take a
break exception.
</p>
</dd>
<dt><code>-n</code></dt>
<dd><p>When this option is used, <code>as</code> will issue a warning every
time it generates a nop instruction from a macro.
</p></dd>
</dl>

<p>The following options are available when as is configured for
an MCore processor.
</p>
<dl compact="compact">
<dt><code>-jsri2bsr</code></dt>
<dt><code>-nojsri2bsr</code></dt>
<dd><p>Enable or disable the JSRI to BSR transformation.  By default this is enabled.
The command line option &lsquo;<samp>-nojsri2bsr</samp>&rsquo; can be used to disable it.
</p>
</dd>
<dt><code>-sifilter</code></dt>
<dt><code>-nosifilter</code></dt>
<dd><p>Enable or disable the silicon filter behaviour.  By default this is disabled.
The default can be overridden by the &lsquo;<samp>-sifilter</samp>&rsquo; command line option.
</p>
</dd>
<dt><code>-relax</code></dt>
<dd><p>Alter jump instructions for long displacements.
</p>
</dd>
<dt><code>-mcpu=[210|340]</code></dt>
<dd><p>Select the cpu type on the target hardware.  This controls which instructions
can be assembled.
</p>
</dd>
<dt><code>-EB</code></dt>
<dd><p>Assemble for a big endian target.
</p>
</dd>
<dt><code>-EL</code></dt>
<dd><p>Assemble for a little endian target.
</p>
</dd>
</dl>


<p>See <a href="Meta-Options.html#Meta-Options">Meta Options</a>, for the options available when as is configured
for a Meta processor.
</p>


<p>See the info pages for documentation of the MMIX-specific options.
</p>

<p>See <a href="NDS32-Options.html#NDS32-Options">NDS32 Options</a>, for the options available when as is configured
for a NDS32 processor.
</p>


<p>See <a href="PowerPC_002dOpts.html#PowerPC_002dOpts">PowerPC-Opts</a>, for the options available when as is configured
for a PowerPC processor.
</p>


<p>See the info pages for documentation of the RX-specific options.
</p>
<p>The following options are available when as is configured for the s390
processor family.
</p>
<dl compact="compact">
<dt><code>-m31</code></dt>
<dt><code>-m64</code></dt>
<dd><p>Select the word size, either 31/32 bits or 64 bits.
</p></dd>
<dt><code>-mesa</code></dt>
<dt><code>-mzarch</code></dt>
<dd><p>Select the architecture mode, either the Enterprise System
Architecture (esa) or the z/Architecture mode (zarch).
</p></dd>
<dt><code>-march=<var>processor</var></code></dt>
<dd><p>Specify which s390 processor variant is the target, &lsquo;<samp>g6</samp>&rsquo;, &lsquo;<samp>g6</samp>&rsquo;,
&lsquo;<samp>z900</samp>&rsquo;, &lsquo;<samp>z990</samp>&rsquo;, &lsquo;<samp>z9-109</samp>&rsquo;, &lsquo;<samp>z9-ec</samp>&rsquo;, &lsquo;<samp>z10</samp>&rsquo;,
&lsquo;<samp>z196</samp>&rsquo;, &lsquo;<samp>zEC12</samp>&rsquo;, or &lsquo;<samp>z13</samp>&rsquo;.
</p></dd>
<dt><code>-mregnames</code></dt>
<dt><code>-mno-regnames</code></dt>
<dd><p>Allow or disallow symbolic names for registers.
</p></dd>
<dt><code>-mwarn-areg-zero</code></dt>
<dd><p>Warn whenever the operand for a base or index register has been specified
but evaluates to zero.
</p></dd>
</dl>


<p>See <a href="TIC6X-Options.html#TIC6X-Options">TIC6X Options</a>, for the options available when as is configured
for a TMS320C6000 processor.
</p>



<p>See <a href="TILE_002dGx-Options.html#TILE_002dGx-Options">TILE-Gx Options</a>, for the options available when as is configured
for a TILE-Gx processor.
</p>



<p>See <a href="Visium-Options.html#Visium-Options">Visium Options</a>, for the options available when as is configured
for a Visium processor.
</p>



<p>See <a href="Xtensa-Options.html#Xtensa-Options">Xtensa Options</a>, for the options available when as is configured
for an Xtensa processor.
</p>



<p>The following options are available when as is configured for
a Z80 family processor.
</p><dl compact="compact">
<dt><code>-z80</code></dt>
<dd><p>Assemble for Z80 processor.
</p></dd>
<dt><code>-r800</code></dt>
<dd><p>Assemble for R800 processor.
</p></dd>
<dt><code>-ignore-undocumented-instructions</code></dt>
<dt><code>-Wnud</code></dt>
<dd><p>Assemble undocumented Z80 instructions that also work on R800 without warning.
</p></dd>
<dt><code>-ignore-unportable-instructions</code></dt>
<dt><code>-Wnup</code></dt>
<dd><p>Assemble all undocumented Z80 instructions without warning.
</p></dd>
<dt><code>-warn-undocumented-instructions</code></dt>
<dt><code>-Wud</code></dt>
<dd><p>Issue a warning for undocumented Z80 instructions that also work on R800.
</p></dd>
<dt><code>-warn-unportable-instructions</code></dt>
<dt><code>-Wup</code></dt>
<dd><p>Issue a warning for undocumented Z80 instructions that do not work on R800.
</p></dd>
<dt><code>-forbid-undocumented-instructions</code></dt>
<dt><code>-Fud</code></dt>
<dd><p>Treat all undocumented instructions as errors.
</p></dd>
<dt><code>-forbid-unportable-instructions</code></dt>
<dt><code>-Fup</code></dt>
<dd><p>Treat undocumented Z80 instructions that do not work on R800 as errors.
</p></dd>
</dl>


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<tr><td align="left" valign="top">&bull; <a href="GNU-Assembler.html#GNU-Assembler" accesskey="2">GNU Assembler</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">The GNU Assembler
</td></tr>
<tr><td align="left" valign="top">&bull; <a href="Object-Formats.html#Object-Formats" accesskey="3">Object Formats</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Object File Formats
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<tr><td align="left" valign="top">&bull; <a href="Command-Line.html#Command-Line" accesskey="4">Command Line</a>:</td><td>&nbsp;&nbsp;</td><td align="left" valign="top">Command Line
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